hi all. thanks for the helpful discussion, especially
@godreborn &
@MikeyTaylorGaming.
so I guess what I'm doing now is just simply turning off the network when I'm finished with installing games, until a better solution comes out for 9.0.0 JB.
otherwise the game update will keep downloading again. I know the retail update will always fail to install, but it's kind of a hassle and it consume bandwidth, which I rather use to download pkg files ^^;
I'm now copying games via FTP,so I have to keep the network on. when all games have been downloaded, I'll turn of the network.
it's been a long time I haven't got this much fun with PS4 haha...busy installing games, but no time to play ^^;